I am getting Dish setup this week with the VIP-622 multi-room setup + another standalone receiver for the third room. I am going to use my grandmothers zip code so I can receive those local channels instead of my local channels. The rep mentioned that I won't be able to hook up my phone line since the receivers call home for ppv and other info and my phone number would show up instead of my grandmothers which would throw a red flag. Is this true? Do I really need to worry about that? Thanks in advance.